* Only allow one open connection per event queue * Send the invalid HTTP 502 response that the LL client is expecting for a timeout * Check if the connection is still open before trying to send a response * Use IHttpClientContext.Response() instead of IHttpResponse.Send(), which doesn't work in long-held connections like the event queue * More logging git-svn-id: http://libopenmetaverse.googlecode.com/svn/libopenmetaverse/trunk@2486 52acb1d6-8a22-11de-b505-999d5b087335